SYNTHESES AND STRUCTURES OF A NOVEL TRINAPHTHYLENE HEXAIMINO CRYPTAND- 3 DIFFERENT CONFORMATIONS OF A MACROBICYCLIC LIGAND

A synthesis in good yield of a new hexaimino cryptand containing two t ris(2-aminoethyl)amine moieties bridged by three naphthylene groups is reported. Ag+ and Cu+ cryptates of the ligand have also been prepared and characterized. The cryptand and cryptates have been structurally analyzed by X-ray diffraction, unveiling three different conformations . The macrobicyclic ligand has an anti conformation in the cryptand, b ut has a sym form in each cryptate. Although the Ag+ cryptates have a symmetric structure on the three arms, one of the three arms in the Cu + complex shows remarkable bending. The bent conformation is intrinsic of the Cu+ complex, as indicated by X-ray analyses and MM2 calculatio ns. The temperature dependence of the H-1 NMR spectra has also been in vestigated, revealing fluxional behaviors of the ligand in each compou nd.